Asphalt solution



Patented Dec. 21, 1937 PATENTSOFF-ICE ASPHALT SOLUTION Felix Kaufler and Hilger Peter Schmitz, Munich, Germany, assignors to Dr. Alexander Wacker Gesellschaft fiir Electrochemische Industrie, G. in. b. H., Munich, Germany, a corporation of Germany No Drawing. Application November 22, 1933, Serial No. 699,134. In Germany December 9,

2 Claims.

This invention relates to an improved natural asphalt solution. In the art, asphalt solutions are known in which the volatile constituents consist entirely, or to a considerable extent, of

5 benzol, or benzol derivatives, and are used for various purposes. An objection to such solutions is that their vapors are poisonous and if it be attempted to avoid this objection by the use of benzine, whose vapors are not poisonous, the

solvent effect is unsatisfactory.

We have found that improved natural asphalt solutions can be obtained through the use of paraffin-hydrocarbons boiling between 50 and 200 C. as the essential volatile constituent in conjunction with limited quantities of volatile hydroxylor keto-group bearing compounds which alone do not completely dissolve natural asphalt. As such are adapted, for example, di-

acetone alcohol, butyleneglycol ,3 ethylether,

acetophenone, etc.

While it is known that certain types of asphalts are soluble in hydrocarbons such as gasoline, there are other grades of asphalt of the same or different types which are not completely soluble in such hydrocarbons. It is the purpose of this invention to treat such asphalts so as to make a complete solution thereof. This result is obtained by making a solution of the asphalt in a solvent consisting of the hydrocarbon and a small proportion of an organic compound of the type referred to above. Although neither the hydrocarbon nor the organic compound by itself is capable of completely dissolving the asphalt,

35 the mixture of the two does effect such a solution. This may be because certain of the ingredients are soluble in the hydrocarbon whereas other ingredients are soluble in the organic compound. In any event a complete solution is effected when both materials are present.

7 Example I 40 parts by weight of Gilsonite asphalt are dis- 45 solved in 60 parts by weight of a volatile solvent which consists of 96% paraffin-hydrocarbons boiling between 50 and 200 C. and 4% diacetone alcohol, with complete and stable solution of the asphalt and excellent spreading, adhesive and 50 waterproof qualities.

Example II Similar results are obtained by dissolving Syrian asphalt in a solvent consisting of Parts by weight 1. Parafiin-hydrocarbons 94 Butylenglycol-B-ethylether 6 2. Paraffin-hydrocarbons 96 Diacetone-alcohol 4 3. Paraflin-hydrocarbons 93 Butyl-alcohol 4 Acetone 3 4. Paraffin-hydrocarbons 94 Glycolie acid butylester 5 Spirit abs. 1 5. Paraffin-hydrocarbons 94 Lactic acid ethylester 4 Acetone 2 6. Paraffin-hydrocarbons 95 Ethyl-propyl-ketone 5 7. Paraffin-Enydrocarbons 94 Butanol 4 Diacetone-alcohol 2 8. Parafiin -hydrocarbons 95 Acetone 4 Benzene 1 9. Paraflin-hydrocarbons 95 Acetophenone 5 l0. Paraflin-hydrocarbons 94 Cycloherxanone 6 The specific proportions of paraffin hydrocarbons compound given herein have been found satisfactory in use, but we donot limit ourselves to such proportions, as the percentage of paraffinhydrocarbons boiling between 50 and 200 and the percentage of volatile limited quantities of compound which alone do not dissolve asphalt from 0.5% to 10%. Also, we do not limit ourselves to the specific volatile compounds mentioned herein, as various other alcohols, esterified or etherified glycols, etc., can be used without departing from the scope of the invention.

Solutions so made can have the usual additions of pigments, fillers, resins, drying oils, and the like, and thereby better or more widely usable solutions can be obtained.

Solutions of asphalt according to this invention can be usedfor coating-objects with asphalt or for the impregnation and binding of fibrous, powdery or granular materials.

We claim:

1. A complete and stable asphalt solution comprising about of an asphalt of the class consisting of Gilsonite and Syrian asphalt and about of a solvent, said solvent comprising at least of a parafiin hydrocarbon boiling between 50 C. and 200 C. and, for increasing the solvent action of the paraflin hydrocarbon on the asphalt, less than 10% of an organic compound having a hydroxyl or ketone group of the class consisting of diacetone-alcohol, butylenglycol-B- lactic acid ethylester, ethyl-propyl-ketone, acetone, acetophenone and cyclohexanone.

2. A complete and stable asphalt solution comprising an asphalt of the class consisting of Gilsonite and Syrian asphalt and a solvent, said solution having a consistency suitable for a coating composition, said solvent comprising at least 90% of a parafiin hydrocarbon boiling between 50 C. and 200 C. and, for increasing the solvent action of the paraliin hydrocarbon on the asphalt, less than 10% of an organic compound having a hydroxyl or ketone group of the class consisting of diacetone-alcohol, butylenglycol-fl-ethylether,

butyl alcohol, glycolic acid butylester, lactic acid ethylester, ethyl-propyl-ketone, acetone, acetoethylether, butyl alcohol, glycolic acid butylester,

phenone and cyclohexanone.

FELIX KAUFLER.

15 HILGER- PET. SCHMITZ. 

